Thanks I will be there Sunday.

 

Why you bitin' on my style dog???

 

The mesh does not reduce air flow by 40%, think what you are saying... The potential flow through the rads and condensors is far less than through the mesh, ie more air going in than can ever be going through the rad and condensor. It's a sealed system in the fact that the air can only flow as fast as the highest restriction point will allow - that being the rads.... unless you use grill mesh that is more restrictive than the rads then the mesh will never slow or reduce the airflow...........The air will already be slow moving through the openings as the rads will be slowing the flow. The mesh won't even be noticed.....

If it has such a performance decrease explain cup cars such as this...

 

I agree with 1999. It does reduce flow significantly. Is it enough to hinder performance on a street car, I don't know.

You guys kill me with these thumbnails With regards to the cup car, the mesh looks doesn't look nearly as fine as the OP's car and they don't really have an option. They almost have to do it. There's too much potential for a piece of debris plowing into the radiator and taking them out of the race. I'm sure they use the largest mesh they can get their hands on that will keep most damaging debris out.

 

DDOG great minds think alike. I will be biti'n your rear bumper? I LIKEEEE. Who makes it?

 

I really do disagree. The amount of air 'overspill' you get fair outweighs any reduction the mesh gives. Granted you're obstruucting the flow if it were an open system but it's not. It's governed by the most restrictive part of the system, the rads and condensors.

The advantage to mesh keeping your rads and condensors in 1 piece should justify their addition anyway. Have a look at this thread as an example... https://www.6speedonline.com/forums/...agedy-gt3.html

Ok, maybe the cup pic was misleading but look at OEM mesh grills supplied by Porsche for all GT3s, which have the same radiator positions. This summer alone I've been on 2 track days, 1 Nurburgring weekend, multiple fast hill climbs in Spain (all in heat) and never once noticed a reduction in cooling or increased temp readings due to mesh. Ok, that's extreme compared to road use but I'm just showing that in extreme conditions the mesh airflow is negligable. Everyday road use it wouldn't even factor, other than to save you $$$ on potential rad damage...

 

classic Ohm's law

I=V/R

I=flow (air flow reduced because of lower pressure to radiator)
V=pressure (pressure going to the radiator reduced because of the mesh)
R=restriction (constant radiator fin opening)

for eg: I = 6/2 vs I = 12/2

Flow is proportional to pressure given a constant restriction.

Theoreticaly... 1999Porsche911 is correct.

BTW a put a mesh grill on my third radiator.

 

Yes, I agree, but using Ohm's law does not account for air built up in the 'reservoir' that is the bumper. It's not as simple as stating the increased pressure is proportional to increased flow. All that increased pressure (incoming air) does not just keep building up, once it's in the reservoir only a proportion equal to the rad restriction can be forced through, the rest is expelled back out. If there were no reservoir then I would agree with a simple Ohm's law equation, but there is...
Imagine you have a bottle with no bottom. Turn it upside down and run a tap into it. The amount of water going in is larger than the amount coming out. The excess spills over the top. Increasing the amount of water going in will increase the amount of water coming out, UNTIL you have over spill. Keep increasing the water going in and you increase the amount of water overflowing. You don't simply just increase the pressure at the narrow end and therefore increase the flow out. There comes a point where it easier for the water to escape via overflow than increasing the force through the narrow end.
Again, this is all theory and I'm all for being shown this is incorrect, life is for learning and all that...

 

nice analogy, however the tap water is not representative of fluid/aero dynamics. Air is everywhere and doesnt act like tap water thats filling a bottle.

If you take that same bottle and move it underwater, you will feel resistance... the faster you move that bottle through the water the more resistance you feel. This increase in resistance is actually pressure. This pressure is proportional to the flow of water that is flowing through the small hole of the bottle... at some level, at extremely high pressure... it is no longer proportional but at some other logorithmic curve..... however with pressure increase, flow still increases as well.

Sorry for the thread jack Victor!!! free bump for you

 

Redridge, I stand corrected. That analogy/theory works.

And bump again Victor...

 

And for the non-scientific folks like myself, just stand in front of a fan without the mesh; then hold a big piece of it up between you and the fan to feel the difference

 

Don't forget that restriction also mean increased heat. So, whatever air may be getting to the radiators is warmer than it needs to be.

 

Ok to all you Einsteins what came first the chicken or the egg.

 

Victor, did you change the color of that wing to the right color yet?

 

No thats next when Rob puts on a new rear bumper with the GT3 Fabspeed center exhaust :-)